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Copahue , Chile : deformation of the surface of the volcano.

Thu, Feb, 18, 16
Posted by : Georges VITTON

From 1 to 15 February 2016. The level of activity of the volcano is at the level: YELLOW: changes in the behavior of the volcanic activity.

Time for a eruption: Weeks / month.

Based on the analysis of information obtained through the monitoring equipment and by observations of the volcano, the National Service of Geology and Mining (SERNAGEOMIN) – Volcanológico Observatorio de Los Andes del Sur (OVDAS) announces:

During this period were recorded twenty-eight (28) seismic events, fifteen (15) were classified as volcano tectonic (VT) associated with rock fracturing process.
Similarly, thirteen (13) events associated with the fluid dynamics inside the volcano, of which twelve (12) were identified as long-period earthquakes (LP) and one (1) very long event were recorded (VLPs).

As for the VT type of seismicity, the local magnitude (ML) were lower (M1.5). The most important energy event was located on the northeast side (NE), 1.5 km from El Agrio crater with a depth of about 4 km.
Lp type of events, showed reduced displacement values ( ) less than 8cm2, while local magnitude (ML) were below M1,7.
Seismicity of VLP types presented lower displacement values (DRC) maximum of 10cm2, mostly located around the crater.
During the month, there was a constant tremor signal, mainly associated with particulate emissions (gases and ash) from the crater El Agrio, which recorded values of RDC oscillating , typically less than 4cm2, values considered intermediate for this volcano. The dominant frequencies are concentrated in a frequency width of from 1.0 to 4.5 Hz.

According to data obtained from the four (4) GNSS stations, which seek to measure the deformation of the surface of the volcano, it is noted that the horizontal and vertical components have low amplitude oscillatory changes, similar to those recorded during the previous period. The highest rate of change of the horizontal components is 0.18 cm / month, while the greatest variation in the vertical component is 0.23 cm / month, which shows the general stagnation in inflation this month .
Sulfur dioxide emissions (SO2) recorded by the DOAS equipment (optical absorption spectrometry differential) of the Triplets station, located 5 km to the east-northeast (ENE) of the active crater, presented a mean value of 753 ± 199 t / day and a maximum value observed during the first fortnight of 2735 t / day, recorded on February 13. The average flow is considered at low levels for this volcano.
IP cameras installed near the volcano recorded constant emissions of materials from the active crater El Agrio, accompanied by incandescence. These emissions are mostly characterized by a grayish color showing the presence of particulate matter.

February 18 , 2016. Copahue , Chile :

Source: Sernageomin

Photos : los Andes .com , Carlos Di Nallo .

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